I've been thinking awhile that i might make a similar post to this one at some stage. Not being a programmer and beginning a startup that requires programmers without one at hand already is quite difficult. That being said I personally would never do a pure software startup. However of late i've come up with plenty of good business models that have a software element but also requires skills that I have outside of what they try to teach in a commerce degree. With that situation it seems a more equal partnership and also allows a greater sharing of the main company functions, something that helps down the road. I would suggest you look at doing a startup where you can really contribute to the actual creation of the product/service.
The other thing about writing these pleas for help/founder is that you've got to show a little leg. "Software as a Service business" is hardly going to bring the hordes knocking down your doors. Even if you don't want to give your ideas away at least narrow down the areas of your interest because your much more likely to attract someone good if they already share that interest.
One interesting difference i see between Facebook & Twitter is that i've never seen someone being peer pressured into signing up to Twitter whereas i see it constantly occur for facebook. I too share the 15 year olds position, i signed up to twitter but hardly anyone i know in real life uses it and i'm not interested in celebrities.
This probably doesn't surprise anyone but their current business model is terrible. Why would anyone click on a text based ad which distracts them from the video they want to watch. I don't see why anyone would voluntarily do that. At some point google is going to have to bite the bullet and have video ads. Even if they are on after a video is shown they would be far more effective and desirable for advertisers.
I'm with Facebook on this one, users to some degree trust that their Facebook information isn't freely available on the web. Thats an integral part of their business model that the communication is only with friends. As most people find communication with friends to be more important than communication with others on the web i believe that facebooks business model is far superior to twitters and so there is no reason to change it.
I might just be cynical but i reckon that they are having problems getting people to click on their ads. The redesigns seem to be attempts to fix that problem.